It's more suspicious that the SMALLEST size for a 360 game is always 3.4Gb... It's surely no coincidence that 3.4Gb plus the gig of copy protection files mentioned above equals the capacity of a single-layer DVD? It looks to me as if all games under 3.4Gb are artificially inflated to that size -...
Couple more for you...
Warhammer: Battle March - 6.8Gb - Green
Load Skirmish HDD = 23s
Load Skirmish DVD = 34s
Race Pro - 5.0Gb - White
Load Quick Race on Laguna Seca HDD = 26s
Load Quick Race on Laguna Seca DVD = 24s